/Engine/Source/Runtime/Engine/Classes/GameFramework/MovementComponent.h
Compute a movement direction when contacting two surfaces.
Result in Delta that is the direction to move when contacting two surfaces.
virtual void TwoWallAdjust ( FVector & Delta, const [FHitResult](API\Runtime\Engine\Engine\FHitResult) & Hit, const FVector & OldHitNormal ) const